private void SetDateHeaderHelper(string headerName, DateTime dateTime)
{
#if DEBUG
using (DebugThreadTracking.SetThreadKind(ThreadKinds.User | ThreadKinds.Async)) {
#endif
if (dateTime == DateTime.MinValue)
SetSpecialHeaders(headerName, null); // remove header
else
SetSpecialHeaders(headerName, DateToString(dateTime));
#if DEBUG
}
#endif
}